Recently, I have started to use the LAMMPS program to apply to the deposition process for GaN system. At the first time, in order to make GaNsubstrate (Wurtize structure), I made the read_data file. To make the substrate, periodic boundary condition is usually applied in both x and y directions and the position of the bottommost two layers are fiixed. On the other hand, the atomic position of the other remaining layers is varied corresponding to the temperaure that I wish.
I don’t know how to set the specific region, such as fixed region, clamp region, and open surface region. Actually, I couldn’t use the ‘region’ command in LAMMPS program. When I used the ‘region’ command, I could observe the error message - ‘Use of region with undefined lattice’.
How can I solve this problem? Could you comment for me about this problem? I’ll wait for your reply e-mail.